Do we need covalent bonding of Si nanoparticles on graphene oxide for Li-ion batteries?

2014 ◽  
Vol 173 ◽  
pp. 391-402 ◽  
Author(s):  
Yana Miroshnikov ◽  
Gal Grinbom ◽  
Gregory Gershinsky ◽  
Gilbert D. Nessim ◽  
David Zitoun
Keyword(s):  
Graphene Oxide ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
High Rate ◽  
Li Ion Batteries ◽  
Mechanical Mixing ◽  
Annealing Step ◽  
Si Nanoparticles ◽  
Li Ion ◽  
Oxide Composites

In this manuscript, we report our investigation of anode materials for Li-ion batteries based on silicon–graphene oxide composites. Previous reports in the literature on silicon–graphene oxide (GO) composites as anodes have shown a large discrepancy between the electrochemical properties, mainly capacity and coulombic efficiency. In our research, the surface chemistry of Si nanoparticles has been functionalized to yield a chemical bond between the Si and GO, a further annealing step yields a Si–reduced GO (Si–rGO) composite while controlled experiments have been carried on mechanical mixing of GO and Si. For all samples, including a simple mixing of Si nanoparticles and GO, a high specific capacity of 2000 mA h gSi−1can be achieved for 50 cycles. The main difference between the samples can be observed in terms of coulombic efficiency, which will determine the future of these composites in full Li-ion cells. The Si–rGO composite shows a very low capacity fading and a coulombic efficiency above 99%. Furthermore, the Si–rGO composite can be cycled at very high rate to 20 C (charge in 3 minutes).

scholarly journals Improving Fast Charging-Discharging Performances of Ni-Rich LiNi0.8Co0.1Mn0.1O2 Cathode Material by Electronic Conductor LaNiO3 Crystallites

Materials ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 396
Author(s):  
Tongxin Li ◽  
Donglin Li ◽  
Qingbo Zhang ◽  
Jianhang Gao ◽  
Long Zhang ◽  
...  
Keyword(s):  
Coulombic Efficiency ◽  
Specific Capacity ◽  
High Energy ◽  
Carbon Composite ◽  
High Rate ◽  
Li Ion Batteries ◽  
Electronic Conductor ◽  
Fast Charging ◽  
Li Ion ◽  
First Time

Fast charging-discharging is one of the important requirements for next-generation high-energy Li-ion batteries, nevertheless, electrons transport in the active oxide materials is limited. Thus, carbon coating of active materials is a common method to supply the routes for electron transport, but it is difficult to synthesize the oxide-carbon composite for LiNiO2-based materials which need to be calcined in an oxygen-rich atmosphere. In this work, LiNi0.8Co0.1Mn0.1O2 (NCM811) coated with electronic conductor LaNiO3 (LNO) crystallites is demonstrated for the first time as fast charging-discharging and high energy cathodes for Li-ion batteries. The LaNiO3 succeeds in providing an exceptional fast charging-discharging behavior and initial coulombic efficiency in comparison with pristine NCM811. Consequently, the NCM811@3LNO electrode presents a higher capacity at 0.1 C (approximately 246 mAh g−1) and a significantly improved high rate performance (a discharge specific capacity of 130.62 mAh g−1 at 10 C), twice that of pristine NCM811. Additionally, cycling stability is also improved for the composite material. This work provides a new possibility of active oxide cathodes for high energy/power Li-ion batteries by electronic conductor LaNiO3 coating.

scholarly journals Demonstrating the steady performance of iron oxide composites over 2000 cycles at fast charge-rates for Li-ion batteries

2016 ◽  
Vol 52 (46) ◽  
pp. 7348-7351 ◽  
Author(s):  
Z. Sun ◽  
E. Madej ◽  
A. Genç ◽  
M. Muhler ◽  
J. Arbiol ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Electrode Materials ◽  
Specific Capacity ◽  
Negative Electrode ◽  
Li Ion Batteries ◽  
Capacity Retention ◽  
Carbon Coated ◽  
Li Ion ◽  
Oxide Composites ◽  
Negative Electrode Materials

The feasibility of using iron oxide as negative electrode materials for safe high-power Li-ion batteries is demonstrated by a carbon-coated FeOx/CNTs composite which delivered specific capacity retention of 84% (445 mA h g−1) after 2000 cycles at 2000 mA g−1 (4C).

scholarly journals B-Doped Si@C Nanorod Anodes for High-Performance Lithium-Ion Batteries

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Shibin Liu ◽  
Jianwei Xu ◽  
Hongyu Zhou ◽  
Jing Wang ◽  
Xiangcai Meng
Keyword(s):  
High Performance ◽  
Coulombic Efficiency ◽  
Low Cost ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Li Ion Batteries ◽  
High Specific Capacity ◽  
Production Strategy ◽  
Li Ion ◽  
B Doping

B doping plays an important role in improving the conductivity and electrochemical properties of Si anodes for Li-ion batteries. Herein, we developed a facile and massive production strategy to fabricate C-coated B-doped Si (B-Si@C) nanorod anodes using casting intermediate alloys of Al-Si and Al-B and dealloying followed by C coating. The B-Si@C nanorod anodes demonstrate a high specific capacity of 560 mAg-1, with a high initial coulombic efficiency of 90.6% and substantial cycling stability. Notably, the melting cast approach is facile, simple, and applicable to doping treatments, opening new possibilities for the development of low-cost, environmentally benign, and high-performance Li-ion batteries.

Performance enhancement of Li-ion batteries by the addition of metal oxides (CuO, Co3O4)/solvothermally reduced graphene oxide composites

2012 ◽  
Vol 69 ◽  
pp. 358-363 ◽  
Author(s):  
Kwang-Hyun Kim ◽  
Dong-Won Jung ◽  
Viet Hung Pham ◽  
Jin Suk Chung ◽  
Byung-Seon Kong ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Metal Oxides ◽  
Reduced Graphene Oxide ◽  
Performance Enhancement ◽  
Li Ion Batteries ◽  
Reduced Graphene ◽  
Li Ion ◽  
Oxide Composites

scholarly journals Coaxial MoS2@carbon Hybrid Fibers: A Low-Cost Anode Material for High-Performance Li-Ion Batteries

2017 ◽  
Author(s):  
Rui Zhou ◽  
Jian-Gan Wang ◽  
Hongzhen Liu ◽  
Huanyan Liu ◽  
Dandan Jin ◽  
...  
Keyword(s):  
High Performance ◽  
Low Cost ◽  
Specific Capacity ◽  
Rate Capability ◽  
High Rate ◽  
Carbon Substrate ◽  
Carbon Composites ◽  
Li Ion Batteries ◽  
Hybrid Fibers ◽  
Li Ion

A low-cost bio-mass-derived carbon substrate has been employed to synthesize MoS2@carbon composites through a hydrothermal method. Carbon fibers derived from natural cotton provide a three-dimensional and open framework for the uniform growth of MoS2 nanosheets, thus constructing hierarchically coaxial architecture. The unique structure could synergistically benefit fast Li-ion and electron transport from the conductive carbon scaffold and porous MoS2 nanostructures. As a result, the MoS2@carbon composites, when served as anodes for Li-ion batteries, exhibit a high reversible specific capacity of 820 mAh g-1, high-rate capability (457 mAh g-1 at 2 A g-1), and excellent cycling stability. The superior electrochemical performance makes the MoS2@carbon composites to be low-cost and promising anode materials for Li-ion batteries.

TiO2–B nanorods on reduced graphene oxide as anode materials for Li ion batteries

2015 ◽  
Vol 51 (3) ◽  
pp. 507-510 ◽  
Author(s):  
Mengmeng Zhen ◽  
Shengqi Guo ◽  
Guandao Gao ◽  
Zhen Zhou ◽  
Lu Liu
Keyword(s):  
Graphene Oxide ◽  
Lithium Ion Batteries ◽  
Anode Materials ◽  
Lithium Ion ◽  
High Rate ◽  
Rate Performance ◽  
Li Ion Batteries ◽  
Reduced Graphene ◽  
Li Ion ◽  
High Rate Performance

TiO2–B nanorods combined with 2D RGO nanosheets presented a good high-rate performance for lithium ion batteries.

scholarly journals Synthesis of Sodium Cobalt Fluoride/Reduced Graphene Oxide (NaCoF3/rGO) Nanocomposites and Investigation of Their Electrochemical Properties as Cathodes for Li-Ion Batteries

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 547
Author(s):  
Jiwoong Oh ◽  
Jooyoung Jang ◽  
Eunho Lim ◽  
Changshin Jo ◽  
Jinyoung Chun
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Close Contact ◽  
Specific Capacity ◽  
Reversible Capacity ◽  
Li Ion Batteries ◽  
One Pot ◽  
Reduced Graphene ◽  
Li Ion ◽  
Cobalt Fluoride

In this study, sodium cobalt fluoride (NaCoF3)/reduced graphene oxide (NCF/rGO) nanocomposites were fabricated through a simple one-pot solvothermal process and their electrochemical performance as cathodes for Li-ion batteries (LIBs) was investigated. The NCF nanoclusters (NCs) on the composites (300–500 nm in size) were formed by the assembly of primary nanoparticles (~20 nm), which were then incorporated on the surface of rGO. This morphology provided NCF NCs with a large surface area for efficient ion diffusion and also allowed for close contact with the conductive matrix to promote rapid electron transfer. As a cathode for LIBs, the NCF/rGO electrode achieved a high reversible capacity of 465 mAh·g−1 at 20 mA·g−1 via the conversion reaction, and this enhancement represented more than five times the reversible capacity of the bare NCF electrode. Additionally, the NCF/rGO electrode exhibited both better specific capacity and cyclability within the current density testing range (from 20 to 200 mA·g−1), compared with those of the bare NCF electrode.

scholarly journals Improving Cyclability of Lithium Metal Anode via Constructing Atomic Interlamellar Ion Channel for Lithium Sulfur Battery

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Mao Yang ◽  
Nan Jue ◽  
Yuanfu Chen ◽  
Yong Wang
Keyword(s):  
Ion Channel ◽  
Coulombic Efficiency ◽  
Specific Capacity ◽  
Absorption Capacity ◽  
Lithium Metal ◽  
Metal Anode ◽  
Lithium Metal Anode ◽  
Li Ion ◽  
Sulfur Battery ◽  
Rapid Transfer

AbstractUniform migration of lithium (Li) ions between the separator and the lithium anode is critical for achieving good quality Li deposition, which is of much significance for lithium metal battery operation, especially for Li–sulfur (Li–S) batteries. Commercial separators such as polypropylene or polyethylene can be prepared by wet or dry processes, but they can indeed cause plentiful porosities, resulting in the uneven Li ion stripping/plating and finally the formation of Li dendrites. Thence, we constructed an atomic interlamellar ion channel by introducing the layered montmorillonite on the surface of the separator to guide Li ion flux and achieved stable Li deposition. The atomic interlamellar ion channel with a spacing of 1.4 nm showed strong absorption capacity for electrolytes and reserved capacity for Li ions, thus promoting rapid transfer of Li ions and resulting in even Li ion deposition at the anode. When assembled with the proposed separator, the Coulombic efficiency of Li||Cu batteries was 98.2% after 200 cycles and stable plating/stripping even after 800 h was achieved for the Li||Li symmetric batteries. Importantly, the proposed separator allows 140% specific capacity increase after 190 cycles as employing the Li–S batteries.

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